Actually, it seems to be talking about a spherical disk. Here is the verse.
He sits enthroned above the circle of the earth, and its people are like grasshoppers. He stretches out the heavens like a canopy, and spreads them out like a tent to live in.~ Isaiah 40:22 If his throne is "above" the Earth, then which direction is "above" on a round Earth? "Above" for The U.S. is a completely different direction than "above" for Australia, Antarctica, China, etc.
Also, you are forgetting a few verses as well...
I looked, and there before me stood a tree in the middle of the land. Its height was enormous. 11 The tree grew large and strong and its top touched the sky; it was visible to the ends of the earth.~ Daniel 4:10-11 How is it possible to see a tree from the "ends of the earth" if the Earth is round?
Or this one...
Again, the devil took him to a very high mountain and showed him all the kingdoms of the world and their splendor.~ Matthew 4:8
How is it possible to see all the kingdoms of the world on a round Earth?